1. 1.2 Points, Line Segments, Lines and Rays…OH MY!

2. Solve these subtraction problems. Write your answer on your slate.
Mental Math
Solve these subtraction problems.
Write your answer on your slate.
9 – 0 =
12 – 6 =
16 – 9 =
17 – 8 =
90 – 40 =
140 – 70 =

3. Math Message Read SRB pages 88 and 89.
In your Math Notebook, please list three places where geometry can be found in our world.
Be ready to share.

4. Reviewing Points, Line Segments, Lines and Rays
When you connect two points using a straightedge, you create a
line segment A B
points

5. Points, Endpoints and Line SegmentsB
line segment
letters are often used to name a line segment
ONE name for this line segment is “line segment AB”
A short way to write “line segment AB” is AB
Another name for this line segment is “line segment BA”
What is the short way to write “line segment BA?”

6. Stop and Chat!
endpoint
endpoint A B
How would you describe a line segment to someone who has never seen one before?
What are some examples of line segments that we can find in the world?
EXAMPLE: part of a spider web

7. Lines
point
point A B
lines
extending line segment AB in both directions and drawing an arrowhead at each end makes a LINE
This line is called “line AB” or “line BA”
A short way to write the names of these lines is
AB or BA

8. Stop and Chat! A B How is a line different from a line segment?
point
point A B
How is a line different from a line segment?
What are some examples of lines that we can find in the world?
EXAMPLE: The horizon in a landscape

9. Short way to write the name is CD
Ray
endpoint
point C D
rays
line segment that goes on without end in only ONE
direction
Point C is the ENDPOINT of the ray CD
The letter that names the ENDPOINT is ALWAYS
written first.
Short way to write the name is CD

10. What are some examples of lines that we can find in the world?
Stop, Try and Chat!
endpoint
point C D
Short way to write the name is CD
On your slate, draw ray ZY. Remember that the endpoint of the ray is ALWAYS written first.
What are some examples of lines that we can find in the world?
Example: Hitting a golf ball

11. Let’s Review! Is it ever possible to draw all of a line?
All of a line segment? All of a ray?
How many line segments can you name using the points marked on this line?
How many rays can you name?

12. Independent work MJ page 4
You can use SRB pages 90 and 91 to help you!

13. Wrap it UP! In your Math Notebook… Draw and label YX Draw and label HG
Draw and label VB

14. Addition Top-It

15. Tonight’s Homework

16. Math Boxes